Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Yu, Fan; Xu, Xianglan; Peng, Honggen; Yu, Hua‐Jiang; Dai, Yanfeng; Liu, Wenming; Ying, Jiawei; Sun, Qi; Wang, Xiang

doi:10.1016/j.apcata.2015.09.023

Cited by 72 publications

(36 citation statements)

References 52 publications

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“…All catalysts exhibit the nitrogen sorption isotherm of type IV with a hysteresis loop of H3. The average pore size is in the range between 2 and 35 nm, indicative of mesopores formed by the stacking of particles in the samples . Compared with ZnO carriers (Table ), a decreasing trend of pore volume and specific surface area is clearly observed due to the load of CuO.…”

Section: Resultsmentioning

confidence: 91%

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Wei

Gao

et al. 2020

Energy Tech

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CO2 hydrogenation to methanol is a prospective approach to alleviate both global warming and energy problems. CuO/ZnO is proven to be an efficient catalyst, in which ZnO carriers prepared by different methods directly affect the catalytic activity. Herein, a novel method is used to apply a zeolite imidazolate framework‐8 (ZIF‐8)‐derived ZnO to the carrier of copper‐based catalyst. In the process of thermal transformation from ZIF‐8 to ZnO, the carrier ZnO‐400 is specially modified by carbon inherited from ZIF‐8, and the corresponding CuO/ZnO‐400 catalyst still has special carbon modification, which is confirmed by transmission electron microscopy (TEM), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Meanwhile, the pyrolysis temperature of ZIF‐8 affects the surface oxygen defects of ZnO and the CuO/ZnO‐400 catalyst has a large oxygen vacancy concentration, which is proven by X‐ray diffraction (XRD) and XPS. Consequently, the CuO/ZnO‐400 catalyst achieves the best CO2 conversion and methanol selectivity due to more oxygen vacancies and carbon modification.

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Section: Resultsmentioning

confidence: 91%

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Wei

Gao

et al. 2020

Energy Tech

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“…In brief, the H 2 ‐TPR and O 2 ‐TPD results demonstrated that both the activity and the amount of active oxygen species were higher in Pd‐CeNW@SiO 2 . These factors are believed to be favorable to accelerate CH 4 oxidation . In situ DRIFT spectra of CH 4 combustion on Pd‐CeNW@SiO 2 (Supporting Information, Figures S11 and S12) showed that the bands (1120 cm −1 ) assigning to bicarbonate increased after CH 4 adsorption with time and disappeared after O 2 introduction.…”

Section: Methodsmentioning

confidence: 99%

Confined Ultrathin Pd‐Ce Nanowires with Outstanding Moisture and SO₂ Tolerance in Methane Combustion

et al. 2018

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An efficient strategy (enhanced metal oxide interaction and core-shell confinement to inhibit the sintering of noble metal) is presented confined ultrathin Pd-CeO x nanowire (2.4 nm) catalysts for methane combustion, which enable CH 4 total oxidation at alow temperature of 350 8 8C, muchlower than that of ac ommercial Pd/Al 2 O 3 catalyst (425 8 8C). Importantly, unexpected stability was observed even under harsh conditions (800 8 8C, water vapor,and SO 2 ), owing to the confinement and shielding effect of the porous silica shell together with the promotion of CeO 2 .Pd-CeO x solid solution nanowires (Pd-Ce NW) as cores and porous silica as shells (Pd-CeNW@SiO 2 ) were rationally prepared by af acile and direct self-assembly strategy for the first time.T his strategy is expected to inspire more active and stable catalysts for use under severe conditions (vehicle emissions control, reforming,a nd water-gas shift reaction).Natural gas is widely used in power generation and other heating applications on account of its abundance worldwide and its high hydrogen/carbon ratio.M ethane,t he main component of natural gas,i sk nown to be as erious greenhouse gas with an effect about 20 times that of CO 2 . [1] Catalytic total combustion of methane (CH 4 )a tl ow temperature is an effective method of preventing it from polluting the atmosphere.I ti sw idely acknowledged that palladium (Pd)-based catalysts are the most active for CH 4 combustion. [2] However,the catalytic activity of Pd alone is somewhat limited, and the high surface energy of Pd nanospecies often leads to the sintering and growth of Pd during the hightemperature process. [1b, 3] Cerium oxide has been used in catalytic CH 4 combustion as ar obust support material. [4] It exhibits excellent redox properties as well as outstanding oxygen storage capacity. [4b,5] TheP d-CeO 2 catalytic system is especially attractive for its high activity and stability in CH 4 combustion, which is contributed by not only the active component (PdO x )b ut also the strong Pd-CeO 2 interaction. [6] Considering the similar radius of the Pd 2+ ion (0.86 )and the Ce 4+ ion (0.87 ), the formation of the solid solution or highly dispersed Pd-Ce-O mixed oxide is considerably enhanced, which can generate more surface oxygen vacancies and under-coordinated oxygen atoms. [7] Accordingly,t he catalytic activity and the thermal stability of ceria-supported noble metal catalysts for CH 4 combustion can be greatly improved. [8] Encapsulation of metal nanoparticles (NPs) into an anoporous shell to assemble ac ore@shell structure is an effective strategy to resist particle aggregation and to protect active centers from poisoning species. [9] It could restrain the contact between metal NPs to keep active sites stable even under harsh conditions,meanwhile allowing the free diffusion of reactant molecules into and out of the shells. [9c] Cargnello et al. reported ac atalyst with PdO encapsulated in small cerium oxide NPs,which showed high thermal stability for inhibiting the sintering of...

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“…The sc-NiO displayed a broad asymmetrical reduction peak centred at approximately 375 °C, which was believed to be originated from the reduction of Ni 3+ to Ni 2+ and further to elemental nickel. 28,29 While for sc-Pd/NiO, a much lower NiO reduction peak at approximately 315 °C were observed.…”

Section: Valence State Measurementsmentioning

confidence: 97%

“…2c, the ratios of Ni 3+ :Ni 2+ were measured in the sequence of sc-Pd/NiO > sc-Pd/NiO-R > sc-NiO. Since the Ni 3+ was reported to be created by the formation of cation defects in NiO 29 , the sc-Pd/NiO with the most Ni 3+ was expected to have the highest amounts of defects amongst investigated catalysts.…”

Section: Valence State Measurementsmentioning

confidence: 99%

In situ valence modification of Pd/NiO nano-catalysts in supercritical water towards toluene oxidation

Meng

Weng

et al. 2018

Catal. Sci. Technol.

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Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Cited by 72 publications

References 52 publications

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Confined Ultrathin Pd‐Ce Nanowires with Outstanding Moisture and SO₂ Tolerance in Methane Combustion

In situ valence modification of Pd/NiO nano-catalysts in supercritical water towards toluene oxidation

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Porous NiO nano-sheet as an active and stable catalyst for CH4 deep oxidation

Cited by 72 publications

References 52 publications

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO2 Hydrogenation to Methanol

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO2 Hydrogenation to Methanol

Confined Ultrathin Pd‐Ce Nanowires with Outstanding Moisture and SO2 Tolerance in Methane Combustion

In situ valence modification of Pd/NiO nano-catalysts in supercritical water towards toluene oxidation

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Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Carbon‐Modified CuO/ZnO Catalyst with High Oxygen Vacancy for CO₂ Hydrogenation to Methanol

Confined Ultrathin Pd‐Ce Nanowires with Outstanding Moisture and SO₂ Tolerance in Methane Combustion